You can, with some small difficulty. It will be infinitely easier if you make sure that you have a full backup of your entire system before upgrading, so that you can quickly restore to that state if necessary. (Actually, you'll want a minimum of two completely separate backups to really be safe.)

Thanks Thomas, I have a brand new MacBook Pro, so there's not a lot on it. I installed CS3 from a previous Time Machine Backup from my Imac, so that worked. The Imac is running 10.5... Just unfamiliar with the latest versions of 10x due to software incompatibilities/non-upgrading...

Still, even though there's not much on it, the only way to downgrade without a good backup is to reboot into Internet recovery mode and reinstall Lion from there, which will require re-downloading the whole thing. Or, if the machine came with a system older than Lion, reinstalling Snow Leopard, upgrading to 10.6.8, then re-downloading Lion, then installing that! Do yourself a favor and make that backup, no matter how little personal data is on the machine.

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